Monitor reads no input signal - Dell UltraSharp 2405FPW 24" Flat Panel LCD Monitor

I do not know how many Thinkvision models are out there, but here is a site that offers manuals you can read online or download.
This is just a page from the manual I found. Here is a link to the manual I found. http://www.manualslib.com/manual/91948/Lenovo-Thinkvision-E54.html#manual
THIS MONITOR WILL APPEAR TO BE NON-FUNCTIONAL IF
THERE IS NO VIDEO INPUT SIGNAL. IN ORDER FOR THIS
MONITOR TO OPERATE PROPERLY, THERE MUST BE A VIDEO
INPUT SIGNAL.
This feature is designed to conserve electrical energy by reducing power
consumption when there is no video input signal present.when there is no
video input signal present.When there is no video input signal, this monitor,
following a time-out period,will automatically switch to an OFF mode. And the
LED will turn orange. This reduces the monitor's internal power supply
consumption. After the video input signal is restored, full power is restored
and the display is automatically redrawn. The appearance is similar to a
"Screen Saver" feature except the display is completely off. The display is
restored by pressing a key on the keyboard, or clicking the mouse. Lenovo ThinkVision E54 User Manual

no input or signal means that the monitor is not receiving any signal from the CPU and if the power light is amber then and the cpu works fine then there could be a problem with the cable connecting the CPU and the monitor ...check the cable.

This means that your monitor is not receiving a signal from your computer. The easiest way to fix this is to plug the monitor into the computer. I hope this helps and have a nice day!

Problem in the data input board(VGA or DVI).Replace the board.

That "red white green and blue" block is a color pattern tester. that means the monitor is on, but is not receiving a signal, so its running tests. If your monitor has Digital input and VGA input, you may just need to switch inputs. Look for 1 or VGA if youre using the blue hook up. look for 2 or digital or dvi if youre using the larger white hook up. Some monitors also have 'auto detect'. If you are in "auto detect' bbut the color box is still there, then your monitor is not receiving video signal from the computer. It could indicate a bad cable or no signal being sent by the machine. If you try another monitor, you can see if the machine is working. I would try a monitor setting for VGA-1 first, since thats most common.

The message input signal means no signal is being feed to the monitor.
Check the cable use to connect the monitor to the video card.. fix and secure the connection.
If the computer is reading and you know its working, check the video card.
Turn off the CPU disconnect the video card from the motherboard and reconnect.
Try to open your CPU and see if it reacts with your monitor. If nothing happens replace your video card

It shows out of range because the PC is sending out the video signal that is higher than the monitor can display, you need to set the PC video resolution to the native resolution: 1024 x 768 @60Hz. You can reboot the PC into save mode (hitting F8 key while booting up) then set the resolution to 640 x 480 (try 1024 x 768 if it allows you to do so), reboot and reset the resoltion to 1024 x 768 @60Hz.

That means that the input from the monitor has no read able signal
Either the monitor is bad or the onboard or video card
Take the monitor and hook it up to a different PC to see if it works or hook a different monitor into that PC, that will ID which problem you have

Could be your graphics cards....
Was you tampering in BIOS before it started the "No Signal Input"?
If so, it'd wise to take your clock out and put it back in.
(Clock = brattrie in the PC tower, Leave it out for 2 - 9 hours maybe even a day)

You need to change the input on your tv - does your remote have an input button